ML12110A167
ML12110A167 | |
Person / Time | |
---|---|
Site: | Oconee, Callaway ![]() |
Issue date: | 04/17/2012 |
From: | Flusche B Swagelok Co |
To: | Office of Nuclear Reactor Regulation |
References | |
47842 | |
Download: ML12110A167 (9) | |
Text
0411712012 U.S. Nuclear Regulatory Commission Operations Center Event Report Page I Part 21 (PAR)Event# 47842 Rep Org: SWAGELOK COMPANY Notification Date I Time: 04/17/2012 13:51 (EDT)Supplier:
SWAGELOK COMPANY Event Date / Time: 04/17/2012 (EST)Last Modification:
04/17/2012 Region: Docket #: City: Agreement State: No County: License #: State: NRC Notified by: BRUCE FLUSCHE Notifications:
REBECCA NEASE R2DO HQ Ops Officer: JOHN SHOEMAKER NEIL OKEEFE R4DO Emergency Class: NON EMERGENCY PART 21 GROUP EMAIL 10 CFR Section: 21.21 (d)(3)(i)
DEFECTS AND NONCOMPLIANCE PART 21 REPORT -SWAGELOK U SERIES BELLOWS VALVES LOOSENING OF STEM TIPS'Swagelok received a return from Duke Energy (Oconee) for two 8U series bellows valves for investigation of stem tips that had loosened during performance testing of equipment."Our evaluation confirmed loosening of the stem tips and determined the root cause to be higher than normal torque being applied to the valve handle during closure. (Please note that we did not specify a minimum or maximum torque for our operating instructions.)
This caused the stem and the stem insert interface to loosen, but not fully disengage.
Our tests show that closure to catalog specification of 4.0 x 10-9 atm. cc/sec of helium can still be achieved with this condition."Therefore, it is the opinion of Swagelok that there is no inherent safety risk associated due to this condition, however lower than expected flow through the valve, or erratic flow, can occur if the stem tip loosens. If utilities consider full flow as a safety function, they should evaluate the valves currently in service for this condition."Applicability
-There have been no other field returns for this condition.
The possible condition extends to the Swagelok 4U, 6U and 8U series bellows valves. Only hand operated valves are susceptible; air operated valves are excluded, as are the 12U series valves supplied by Swagelok." Callaway may also be affected and will be notified by the Supplier.
HOO Hoc To:
Subject:
Attachments:
See attached.HOO Hoc Event Notice #47842: Swagelok Part 21 Notice -4/17/2012 Swagelok Part 21 .pdf; Summary.pdf; Events.pdf Headquarters Operations Officer U.S. Nuclear Regulatory Commission Phone: 301-816-5100 Fax: 301-816-5151 email: hoo.hoc@nrc.gov secure e-mail: hool@nrc.sgov.gov I
Swagelok Company 29495 FA. Lennon Drive Solon, Ohio 44139-3933 8w&%Q\0&-440 349 5600 440 519 3304 fax www.swaaelok.com Date: To: From: Total Pages:
Subject:
April 17, 2012 Document Control Desk Nuclear Regulatory Commission Bruce Flusche Part 21 Coordinator Swagelok Company 7 (including cover)Potential part 21 notification Will call you shortly to confirm receipt CONFIDENTIALITY NOTE; This cover sheet and the documents accompanying it contain confidential Information that belongs to the sender and is legally privileged, The information is intended unly for use by the recipient named above.If you are not the Intended reciplient, be aware that any disclosure, copying, distribution, or use of its contents is prohibited.
If you have received this communication in error, please telephone the sender Immediately.
April 17, 2012 Nuclear Regulatory Commission Document Control Desk Washington, D.C. 20555-0001 Subiect: Potential IOCFR21 notification Purpose We are writing to inform you of a potential issue regarding manually operated Swagelok U series bellows valves.Swagelok received a return from Duke Energy for two 8U series bellows valves for investigation of stem tips that had loosened during performance testing of equipment.
Our evaluation confirmed loosening of the stem tips and determined the root cause to be higher than normal torque being applied to the valve handle during closure. (Please note that we did not specify a minimum or maximum torquefor our operating instructions,)
This caused the stem and the stem insert interface to loosen, but not fully disengage.
Our tests show that closure to catalog specification of 4,0 x 10-9 atm. cc/sec of helium can still be achieved with this condition.
Therefore, it is the opinion of Swagelok that there is no inherent safety risk associated due to this condition, however lower than expected flow through the valve, or erratic flow, can occur if the stem tip loosens. Ifutilities consider full flow as a safety function, they should evaluate the valves currently in service for this condition, Appelicability There have been no other field returns for this condition.
The possible condition extends to the Swagelok 4U, 6U and 8U series bellows valves. Only hand operated valves are susceptible; air operated valves are excluded, as are the I2U series valves supplied by Swagelok.
Discussion I Stem Stem Insert The picture above shows a cutaway version of a valve in question.Although the stem tip may loosen when higher than normal torque is applied to close the valve, the tip will not become completely disengaged from the stem insert, The document below shows the stack up of tolerances on the SU valve, with a loose stem tip. Even with the tip loosened until it contacts the valve body, at least one thread of engagement still remains between the tip and stem insert. This means the stem tip will remain captured within the valve body and will not enter the process stream. Similar conditions apply to the 4U and 6U Series valves.
Tolerance stack-ups between the stem and stem tip for the OU Series valve Outpu of Ccomponent slack-US.
Details ProPdtay["MSTROKE 0.120?distance of stem adapter IM tt top 0.270-- 'dstance of stem adapter flat to top- Max"MA stne 070945 H C ei to theds an Stem adapwt 0.06 threafpt Winch on adapter 24.0000 number of threads engaged at max! D W1ste w1:h loose G stem (28E.29E10E) 1.64 The continued engagement of the stem threads also means that the valve can be shut off, even if the threads had loosened.
We have tested several conditions of the loose stem tips and confirmed that closure to catalog specification of 4.0 x 10-9 atm. cc/sec of helium can be achieved.Action Lower than expected flow through the valve, or erratic flow, can occur if the stem tip loosens. If utilities consider full flow as a safety function, they should evaluate the valves currently in service for this condition.
Swagelok will be working with the individual plants in question to assess their application of the valve and will take appropriate action.
Revised drawings will be created for the affected utilities, showing both the recommended and maximum allowable closure torques, for the affected valve series.IOCFR21 ImIplications We will confirm receipt of this message to you under the requirements of Part 21 and will forward it to the utilities on the attached list.If you have any questions, please contact: Bruce Flusche Customer Satisfaction Manager 1OCFR21 Coordinator Swagelok Company 29495 F.A. Lennon Drive Solon OH 44139 Bruce.Flusche@Swagelok.com 440 649 5215 office 440 241 4341 cell.... 1 1. -1. ý I .I I .. J..
8%QqQNO\('...
Swagelok CompanyF.A Lennon Drive Solon, Ohio 44139-3933 440 349 5600 440 248 4824 ftx www~swag~oetokmm Sales to Duke EnergylOconee I E... Y. I... or * -I CLMBA SS-4UG-7825 94861 BA39260030 11(28/2007 Y 6 105670 BL75360010 08/25/2008 Y 2 105670 BL75360020 09/05/2008 Y 3 105670 BL75360030 09/19/2008 Y 5 113568 BU92680010 01/28/2009 Y 10 52300157 K573540000 12/08/2006 Y 6 SS-8UG-25017 00122829 Rev 002 EG36780070 11/17/2009 Y 19 SS-8UG-4019 98799 B097100010 02/04/2008 Y 2 SS-8UG-5825 93579 B859860010 1012412007 Y 10 94861 BA25760030 11/28/2007 Y 9 102772 BJ58420030 05/20/2008 Y 12 102772 BJ68420040 06/10/2008 Y 5 103936 BL42030030 07/17/2008 Y 2 103936 BL42030040 08/18/2008 Y 6 108841 BR01530020 09/19/2008 Y 2 108841 BR01530040 12/03/2008 Y 10 110943 BS33570010 12/05/2008 Y 15 113568 BU92670010 02/16/2009 Y 16 52300157 K626240000 12/01(2006 Y 10 SS-8UG-5826 52300215 B643180010 10/10/2007 Y 10 SS-8UG-5826-25017 00141535 Rev001. NE44760020 04/12/2011 Y 4 00141535 Rev 002 NE44760030 05/20/2011 Y 4 152238 NT57100020 02/07/2012 Y 13 SS-8UG-7675 105670 BM36530060 08/19/2008 Y 49..... 105670 BM36530070 09/15/2008 Y 1 GRNVL SS-4UG-7825 N/A N505000000 08/21/2002 Y 10 SS-8UG-4019 NM!9759 E199160000 02/04/2005 Y I SS-8UG-5825 NM22035 E362490000 08/25/2005 Y 5 N/A N343810000 05/09/2002 Y 17 N/A N406470000 07/01/2002 Y 16 N/A N635170000 04/22/2003 Y 8 N/A N779470000 11/10/2003 Y 13 DP72960007310074 N816810000 07/21/2006 Y 9 DP72960007310074 N816810000 06/05/2006 Y I SS-8UG-5826 DP72960007310068 N708590000 05/03/2006 Y 6 DP72960007310005 N13065001 10/04/2004 Y 8 DP72960007310074 N816800000 06/01/2006 Y 17 SS-8UG-7675 N/A N222180000 02/14/2002 Y 61 DP72960007310074 N817280000 07/14/2006 Y 12 ,DP72960007310074 N817280000 06/22/2006 Y 25 Ameren Power I Date IDistributori Customer Name I Customer PO Part number I Qty I Manufacturer Order Number 07/01/2011 DBORN I Ameren Power 53917e SS-6UW-25017 2 MJ1932001 , I A' i rr" .-L